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Masao Fukasawa - One of the best experts on this subject based on the ideXlab platform.
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the generation of large amplitude unsteady lee waves by subinertial k1 tidal flow a possible Vertical Mixing mechanism in the kuril straits
Journal of Physical Oceanography, 2000Co-Authors: Tomohiro Nakamura, Toshiyuki Awaji, Takaki Hatayama, Kazunori Akitomo, Takatoshi Takizawa, Tokihiro Kono, Yasuhiro Kawasaki, Masao FukasawaAbstract:Numerical experiments with a two-dimensional nonhydrostatic model are performed to investigate tidally generated internal waves in the Kuril Straits and their effect on Vertical Mixing. The results show that sill-scale internal waves at the K1 tidal frequency are confined to the sill slopes because the K1 tide is subinertial in the Kuril Straits. In contrast to previous theories, the authors show that intense short internal waves generated at the sill breaks by the subinertial K1 tidal current can propagate upstream as the tidal current slackens. Theoretical considerations identify these short waves as unsteady lee waves, which tend to be trapped at the generation region and grow into large-amplitude waves, eventually inducing vigorous Mixing along their ray paths. In particular, superposition of a propagating unsteady lee wave and a newly generated lee wave over a sill causes significant wave breaking leading to a maximum Vertical diffusivity of ;103 cm2 s21. This quite intense Mixing reaches down to the density layer of the North Pacific Intermediate Water (NPIW). In contrast, the M2 tidal current does not cause such strong Vertical Mixing, because most of generated internal waves propagate away as first-mode internal tides and because the barotropic flow amplitude is small. The authors therefore suggest the possibility that generation of lee waves through interactions between the K1 current and the bottom topography of the Kuril Straits contributes to the observed modification of the Okhotsk Sea water required in the formation of the NPIW.
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the generation of large amplitude unsteady lee waves by subinertial k1 tidal flow a possible Vertical Mixing mechanism in the kuril straits
Journal of Physical Oceanography, 2000Co-Authors: Tomohiro Nakamura, Toshiyuki Awaji, Takaki Hatayama, Kazunori Akitomo, Takatoshi Takizawa, Tokihiro Kono, Yasuhiro Kawasaki, Masao FukasawaAbstract:Abstract Numerical experiments with a two-dimensional nonhydrostatic model are performed to investigate tidally generated internal waves in the Kuril Straits and their effect on Vertical Mixing. The results show that sill-scale internal waves at the K1 tidal frequency are confined to the sill slopes because the K1 tide is subinertial in the Kuril Straits. In contrast to previous theories, the authors show that intense short internal waves generated at the sill breaks by the subinertial K1 tidal current can propagate upstream as the tidal current slackens. Theoretical considerations identify these short waves as unsteady lee waves, which tend to be trapped at the generation region and grow into large-amplitude waves, eventually inducing vigorous Mixing along their ray paths. In particular, superposition of a propagating unsteady lee wave and a newly generated lee wave over a sill causes significant wave breaking leading to a maximum Vertical diffusivity of ∼103 cm2 s−1. This quite intense Mixing reaches do...
Tomohiro Nakamura - One of the best experts on this subject based on the ideXlab platform.
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the generation of large amplitude unsteady lee waves by subinertial k1 tidal flow a possible Vertical Mixing mechanism in the kuril straits
Journal of Physical Oceanography, 2000Co-Authors: Tomohiro Nakamura, Toshiyuki Awaji, Takaki Hatayama, Kazunori Akitomo, Takatoshi Takizawa, Tokihiro Kono, Yasuhiro Kawasaki, Masao FukasawaAbstract:Numerical experiments with a two-dimensional nonhydrostatic model are performed to investigate tidally generated internal waves in the Kuril Straits and their effect on Vertical Mixing. The results show that sill-scale internal waves at the K1 tidal frequency are confined to the sill slopes because the K1 tide is subinertial in the Kuril Straits. In contrast to previous theories, the authors show that intense short internal waves generated at the sill breaks by the subinertial K1 tidal current can propagate upstream as the tidal current slackens. Theoretical considerations identify these short waves as unsteady lee waves, which tend to be trapped at the generation region and grow into large-amplitude waves, eventually inducing vigorous Mixing along their ray paths. In particular, superposition of a propagating unsteady lee wave and a newly generated lee wave over a sill causes significant wave breaking leading to a maximum Vertical diffusivity of ;103 cm2 s21. This quite intense Mixing reaches down to the density layer of the North Pacific Intermediate Water (NPIW). In contrast, the M2 tidal current does not cause such strong Vertical Mixing, because most of generated internal waves propagate away as first-mode internal tides and because the barotropic flow amplitude is small. The authors therefore suggest the possibility that generation of lee waves through interactions between the K1 current and the bottom topography of the Kuril Straits contributes to the observed modification of the Okhotsk Sea water required in the formation of the NPIW.
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the generation of large amplitude unsteady lee waves by subinertial k1 tidal flow a possible Vertical Mixing mechanism in the kuril straits
Journal of Physical Oceanography, 2000Co-Authors: Tomohiro Nakamura, Toshiyuki Awaji, Takaki Hatayama, Kazunori Akitomo, Takatoshi Takizawa, Tokihiro Kono, Yasuhiro Kawasaki, Masao FukasawaAbstract:Abstract Numerical experiments with a two-dimensional nonhydrostatic model are performed to investigate tidally generated internal waves in the Kuril Straits and their effect on Vertical Mixing. The results show that sill-scale internal waves at the K1 tidal frequency are confined to the sill slopes because the K1 tide is subinertial in the Kuril Straits. In contrast to previous theories, the authors show that intense short internal waves generated at the sill breaks by the subinertial K1 tidal current can propagate upstream as the tidal current slackens. Theoretical considerations identify these short waves as unsteady lee waves, which tend to be trapped at the generation region and grow into large-amplitude waves, eventually inducing vigorous Mixing along their ray paths. In particular, superposition of a propagating unsteady lee wave and a newly generated lee wave over a sill causes significant wave breaking leading to a maximum Vertical diffusivity of ∼103 cm2 s−1. This quite intense Mixing reaches do...
Robert D. Hetland - One of the best experts on this subject based on the ideXlab platform.
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relating river plume structure to Vertical Mixing
Journal of Physical Oceanography, 2005Co-Authors: Robert D. HetlandAbstract:Abstract The structure of a river plume is related to the Vertical Mixing using an isohaline-based coordinate system. Salinity coordinates offer the advantage of translating with the plume as it moves or expanding as the plume grows. This coordinate system is used to compare the relative importance of different dynamical processes acting within the plume and to describe the effect each process has on the structure of the plume. Vertical Mixing due to inertial shear in the outflow of a narrow estuary and wind Mixing are examined using a numerical model of a wind-forced river plume. Vertical Mixing, and the corresponding entrainment of background waters, is greatest near the estuary mouth where inertial shear Mixing is large. This region is defined as the near field, with the more saline, far-field plume beyond. Wind Mixing increases the Mixing throughout the plume but has the greatest effect on plume structure at salinity ranges just beyond the near field. Wind Mixing is weaker at high salinity classes tha...
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Relating River Plume Structure to Vertical Mixing
Journal of Physical Oceanography, 2005Co-Authors: Robert D. HetlandAbstract:The structure of a river plume is related to the Vertical Mixing using an isohaline-based coordinate system. Salinity coordinates offer the advantage of translating with the plume as it moves or expanding as the plume grows. This coordinate system is used to compare the relative importance of different dynamical processes acting within the plume and to describe the effect each process has on the structure of the plume. Vertical Mixing due to inertial shear in the outflow of a narrow estuary and wind Mixing are examined using a numerical model of a wind-forced river plume. Vertical Mixing, and the corresponding entrainment of background waters, is greatest near the estuary mouth where inertial shear Mixing is large. This region is defined as the near field, with the more saline, far-field plume beyond. Wind Mixing increases the Mixing throughout the plume but has the greatest effect on plume structure at salinity ranges just beyond the near field. Wind Mixing is weaker at high salinity classes that have already been mixed to a critical thickness, a point where turbulent Mixing of the upper layer by the wind is reduced, protecting these portions of the plume from further wind Mixing. The work done by Mixing on the plume is of similar magnitude in both the near and far fields.
Yasuhiro Kawasaki - One of the best experts on this subject based on the ideXlab platform.
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the generation of large amplitude unsteady lee waves by subinertial k1 tidal flow a possible Vertical Mixing mechanism in the kuril straits
Journal of Physical Oceanography, 2000Co-Authors: Tomohiro Nakamura, Toshiyuki Awaji, Takaki Hatayama, Kazunori Akitomo, Takatoshi Takizawa, Tokihiro Kono, Yasuhiro Kawasaki, Masao FukasawaAbstract:Numerical experiments with a two-dimensional nonhydrostatic model are performed to investigate tidally generated internal waves in the Kuril Straits and their effect on Vertical Mixing. The results show that sill-scale internal waves at the K1 tidal frequency are confined to the sill slopes because the K1 tide is subinertial in the Kuril Straits. In contrast to previous theories, the authors show that intense short internal waves generated at the sill breaks by the subinertial K1 tidal current can propagate upstream as the tidal current slackens. Theoretical considerations identify these short waves as unsteady lee waves, which tend to be trapped at the generation region and grow into large-amplitude waves, eventually inducing vigorous Mixing along their ray paths. In particular, superposition of a propagating unsteady lee wave and a newly generated lee wave over a sill causes significant wave breaking leading to a maximum Vertical diffusivity of ;103 cm2 s21. This quite intense Mixing reaches down to the density layer of the North Pacific Intermediate Water (NPIW). In contrast, the M2 tidal current does not cause such strong Vertical Mixing, because most of generated internal waves propagate away as first-mode internal tides and because the barotropic flow amplitude is small. The authors therefore suggest the possibility that generation of lee waves through interactions between the K1 current and the bottom topography of the Kuril Straits contributes to the observed modification of the Okhotsk Sea water required in the formation of the NPIW.
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the generation of large amplitude unsteady lee waves by subinertial k1 tidal flow a possible Vertical Mixing mechanism in the kuril straits
Journal of Physical Oceanography, 2000Co-Authors: Tomohiro Nakamura, Toshiyuki Awaji, Takaki Hatayama, Kazunori Akitomo, Takatoshi Takizawa, Tokihiro Kono, Yasuhiro Kawasaki, Masao FukasawaAbstract:Abstract Numerical experiments with a two-dimensional nonhydrostatic model are performed to investigate tidally generated internal waves in the Kuril Straits and their effect on Vertical Mixing. The results show that sill-scale internal waves at the K1 tidal frequency are confined to the sill slopes because the K1 tide is subinertial in the Kuril Straits. In contrast to previous theories, the authors show that intense short internal waves generated at the sill breaks by the subinertial K1 tidal current can propagate upstream as the tidal current slackens. Theoretical considerations identify these short waves as unsteady lee waves, which tend to be trapped at the generation region and grow into large-amplitude waves, eventually inducing vigorous Mixing along their ray paths. In particular, superposition of a propagating unsteady lee wave and a newly generated lee wave over a sill causes significant wave breaking leading to a maximum Vertical diffusivity of ∼103 cm2 s−1. This quite intense Mixing reaches do...
Toshiyuki Awaji - One of the best experts on this subject based on the ideXlab platform.
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the generation of large amplitude unsteady lee waves by subinertial k1 tidal flow a possible Vertical Mixing mechanism in the kuril straits
Journal of Physical Oceanography, 2000Co-Authors: Tomohiro Nakamura, Toshiyuki Awaji, Takaki Hatayama, Kazunori Akitomo, Takatoshi Takizawa, Tokihiro Kono, Yasuhiro Kawasaki, Masao FukasawaAbstract:Numerical experiments with a two-dimensional nonhydrostatic model are performed to investigate tidally generated internal waves in the Kuril Straits and their effect on Vertical Mixing. The results show that sill-scale internal waves at the K1 tidal frequency are confined to the sill slopes because the K1 tide is subinertial in the Kuril Straits. In contrast to previous theories, the authors show that intense short internal waves generated at the sill breaks by the subinertial K1 tidal current can propagate upstream as the tidal current slackens. Theoretical considerations identify these short waves as unsteady lee waves, which tend to be trapped at the generation region and grow into large-amplitude waves, eventually inducing vigorous Mixing along their ray paths. In particular, superposition of a propagating unsteady lee wave and a newly generated lee wave over a sill causes significant wave breaking leading to a maximum Vertical diffusivity of ;103 cm2 s21. This quite intense Mixing reaches down to the density layer of the North Pacific Intermediate Water (NPIW). In contrast, the M2 tidal current does not cause such strong Vertical Mixing, because most of generated internal waves propagate away as first-mode internal tides and because the barotropic flow amplitude is small. The authors therefore suggest the possibility that generation of lee waves through interactions between the K1 current and the bottom topography of the Kuril Straits contributes to the observed modification of the Okhotsk Sea water required in the formation of the NPIW.
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the generation of large amplitude unsteady lee waves by subinertial k1 tidal flow a possible Vertical Mixing mechanism in the kuril straits
Journal of Physical Oceanography, 2000Co-Authors: Tomohiro Nakamura, Toshiyuki Awaji, Takaki Hatayama, Kazunori Akitomo, Takatoshi Takizawa, Tokihiro Kono, Yasuhiro Kawasaki, Masao FukasawaAbstract:Abstract Numerical experiments with a two-dimensional nonhydrostatic model are performed to investigate tidally generated internal waves in the Kuril Straits and their effect on Vertical Mixing. The results show that sill-scale internal waves at the K1 tidal frequency are confined to the sill slopes because the K1 tide is subinertial in the Kuril Straits. In contrast to previous theories, the authors show that intense short internal waves generated at the sill breaks by the subinertial K1 tidal current can propagate upstream as the tidal current slackens. Theoretical considerations identify these short waves as unsteady lee waves, which tend to be trapped at the generation region and grow into large-amplitude waves, eventually inducing vigorous Mixing along their ray paths. In particular, superposition of a propagating unsteady lee wave and a newly generated lee wave over a sill causes significant wave breaking leading to a maximum Vertical diffusivity of ∼103 cm2 s−1. This quite intense Mixing reaches do...